Question

Define packing fraction.​

Answer 1

Answer:

it is the define as the ratio of volume occupied by all the atom in until with volume of unit cell.

physical it is the measurement how a solid is packed

simple cubic pf is 52%

BCC pf is 68%

FCC pf is 74%

so a solid have FCC unit cell is more closely packed solid

Answer 2

Answer:

a measure of the loss or gain of total mass in group of nucleons when they are brought together to form an atomic nucleus